#define  __CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<string.h>
int main() {
	char str[] = "abcdeafadfaf";
	int len = strlen(str);
	for (int i = 0;i < len;i++) {
		if (str[i] == 'a'){
			str[i]='*';
		}
	}
	printf("%s\n",str);

	
	return 0;



}